Dr. Elizabeth Hobson | Hobson Lab

Bio: 
Dr. Hobson received her PhD from New Mexico State University and was awarded two independent postdoctoral fellowships, the first at NIMBioS (the National Institute for Mathematical and Biological Synthesis) and the second at the Santa Fe Institute. She started her lab at the University of Cincinnati in Fall 2019 and is currently an Assistant Professor.

Abstract:
In many social species individuals create their social worlds through interaction decisions and are then subject to and constrained by these social constructs, which can affect an individual’s future actions. Understanding how much individuals “know” about their social worlds is critical in understanding these potential feedbacks. However, it is difficult to determine how much information individuals have about the social structures in which they live. In this talk, I summarize several ways my group is addressing these questions by combining empirical experiments with computational approaches to provide insight into cognition through social decisions. I highlight new work on parakeet aggression and dominance hierarchies to illustrate this approach. I show evidence that parakeet rank is unlikely due to individual characteristics and that group-level social dominance patterns can be plastic and can respond to group membership changes. Finally, I show how parallel or related experiments can allow for comparative analyses across species. These approaches, and a taxonomically broad perspective, provide new opportunities to investigate the effect of social information on individual behavior within conflict, and has the potential to provide rigorous evidence for the evolutionary patterns underlying social cognition.

Watch the seminar here!

Dr. Brian Barnes

Bio:
Dr. Barnes is currently a Professor of Zoophysiology with the Institute of Arctic Biology at the University of Alaska in Fairbanks. He's also the Director of Alaska INBRE, an NIH capacity building program in biomedical research and also the Science co-Director at Toolik Field Station. He participated in summer workshops involving biological rhythms at Hopkins Marine Station. He has a  PhD in Zoology from the University of Washington where Jim Kenagy was his advisor. Dr. Barnes received his Post-doc in Psychology and Zoology with Irv Zucker and Paul Licht as advisors. He began as Assistant Professor at the University of Alaska in 1986.

Abstract:
In Alaska, winters begin early, last seemingly forever, are very cold, snowy and dark, as well as extremely beautiful, quiet, and serene. This talk will review the physiological and behavioral strategies available to animals for surviving and coping with arctic winters, including cryobiology in insects, freeze tolerance in frogs, and hibernation in ground squirrels and bears. Using data logging and advanced telemetry, the locations, behavior, sleep, circadian rhythms, cardiovascular patterns, and thermoregulation of animals were recorded as they overwinter under natural conditions.

Cucujus beetle larvae may not freeze at temperatures below -80C, wood frogs freeze almost solid and survive; arctic ground squirrels lose track of time, become torpid while colder than ice but warm to sleep, even as black bears continuously doze, only occasionally snore, and their hearts beat in a syncopated rhythm. Little is known about the genetic and molecular basis of hibernation, but discovering its mechanisms could lead to novel clinical therapies and escape strategies in humans.

Watch the seminar here!

Dr. Carol Baskin 

Abstract:
What controls the timing of seed germination in nature? This question is of much interest because the timing of seed dormancy-break and germination are an important part of the adaptation of a species to its habitat. Thus, we want to know what environmental conditions are required for seed dormancy-break and germination in various kinds of habitats from the tropics to the arctic, i.e. germination ecology.

My first germination experiments were conducted in 1966 when I was a graduate student at Vanderbilt University; I am still expanding my knowledge about seeds of wild plants. My original work/interests have expanded from germination ecology to the world biogeography of nondormancy and of the five classes/kinds of dormancy and to the evolutionary relationships of nondormancy and the classes of dormancy.

I have studied ca. 400 species from Kentucky/Tennessee, as well as species from Hawaii, Tiawan and Sweden. With collaborators, I have been involved in seed germination studies in Argentina, Australia, Brazil, China, India, Iran and Japan. The world biogeography of seed dormancy was part of a book entitled “Seeds: ecology, biogeography, and evolution of dormancy and germination, C.C. Baskin and J.M. Baskin, 1998 (1^st ed.) 2014 (2^nd ed.), Elsevier/Academic Press,” which contained a complication of data on the world biogeography of seed dormancy for ca. 3,000 (1^st ed.) and 13, 600 (2^nd ed.) species. This data set provides an overview of seed dormancy of trees, shrubs and herbs in all the major vegetation zones on earth, and it has now been used by various collaborators to help investigate other aspects of seed biology, including the evolution of seed dormancy (i.e. dormancy transition states).  

I am a plant ecologist, and as such I seek information about the fossils and palaeohistory of seeds, embryo morphology, dormancy-breaking and germination requirements of seeds of species in all the major vegetation zones on earth and evolutionary relationships of nondormancy and the five classes of dormancy. Recently, I have been exploring how palaeohistory, biogeography and phylogeny have influenced seed dormancy-breaking and germination requirements in highly species-rich families such as the Asteraceae (ca. 30,000 species, sunflower family), Myrtaceae (ca. 6,000, Eucalyptus family) and Rubiaceae (ca. 13, 460 species, coffee family).

Watch the seminar here!

Ned Dochtermann | Dochtermann Lab

Abstract:

While behavioral syndromes are frequently argued to represent an optimal outcome of correlated selection, they also have the potential to constrain evolutionary responses. Via intraspecific and interspecific comparisons we attempted to determine whether behavioral variation was distributed in a manner consistent with either (or both) of these explanations. We compared the distribution of genetic variation across four populations of field crickets (Gryllus integer) and for seven behavioral measures. The distribution and orientation of genetic variation was conserved across populations and divergence among populations was constrained to a shared direction in multivariate space. We then compared the distribution of behavioral variation across five species of crickets and identified a strong phylogenetic signal. Combined, these intra- and interspecific comparisons are consistent with behavioral syndromes acting as constraints on evolutionary outcomes. Finally, in a natural population of deer mice (Peromyscus maniculatus) we compared the orientation of behavioral variation with the direction of selection acting on the population. We found that the distribution of behavioral variation was inconsistent with our a priori predictions. These three independent results suggest that intuitive adaptive explanations may be insufficient to explain the ubiquity of behavioral syndromes.

Check out the seminar here!

Dr. Joseph L Graves, Jr.

Bio:

Dr. Joseph Graves, Jr. received his Ph.D. in Environmental, Evolutionary and Systematic Biology from Wayne State University in 1988. In 1994 he was elected a Fellow of the Council of the American Association for the Advancement of Science (AAAS.) In 2012, he was chosen as one of the “Sensational Sixty” commemorating 60 years of the NSF Graduate Research Fellowship Award.  In 2017, he was listed as an “Outstanding Graduates” in Biology at Oberlin College; and was an “Innovator of the Year” in US Black Engineer Magazine.

His research in the evolutionary genomics of adaptation shapes our understanding of biological aging and bacterial responses to nanomaterials. He is presently Associate Director/co-PI of the Precision Microbiome Engineering (PreMiEr) Engineering Research Center of Excellence (Gen-4 ERC) funded by the National Science Foundation (2022—2027). He has published five books: A Voice in the Wilderness: A Pioneering Biologist Explains How Evolution Can Help Us Solve Our Biggest Problems, (New York: Basic Books), 2022; with Alan Goodman, Racism, Not Race: Answers to Frequently Asked Questions, Columbia University Press, 2022. Racism, Not Race was named by Kirkus Reviews as “One of the Best Non-Fiction 2021” and to its “Best Books About Being Black in America 2021”; Principles and Applications of Antimicrobial Nanomaterials, (Amsterdam NE: Elsevier),  2021; The Emperor's New Clothes: Biological Theories of Race at the Millennium, Rutgers University Press, 2005 and The Race Myth: Why We Pretend Race Exists in America, Dutton Press, 2005.

He leads programs addressing underrepresentation of minorities in science. He has aided underserved youth in Greensboro via the YMCA chess program.  He has also served on the Racial Reconciliation and Justice Commission, and COVID Vaccination Task Fore of the Episcopal Diocese of North Carolina. He also served as the science advisor to the Chicago, New Brunswick, and Methodist of Ohio Theological Seminaries through the AAAS Dialogues of Science, Ethics, and Religion (DoSER) program.

Abstract: 

In A Voice in the Wilderness, I discuss the story of how I became the first African American evolutionary biologist.  It was a life of strife that followed me everywhere I went. I was beset by imposter syndrome, by depression, by racism, by negligence, and contempt.  And yet I persevered and became a prominent scholar in evolutionary biology.  I have helped to lead the fight against scientific racism, utilizing my science a tool to resist exploitation and change the demography of the scientific enterprise.



Check out his most recent article here!

Dr. Rafael Demarco | Demarco Lab

Bio:

I am a new Assistant Professor in the Department of Biology at the University of Louisville whose ultimate goal is to understand how changes in metabolism impact stem cell behavior during homeostasis, aging and stress conditions. I was trained as a geneticist during my Ph.D. with Dr. Erik Lundquist at the University of Kansas, where I learned to ask questions and interpret genetic data using model organisms. To pursue my objective of studying stem cells and their niches, I obtained my postdoctoral training and later position as a Research Specialist in the laboratory of Dr. Leanne Jones (first at the Salk Institute and then at the University of California, Los Angeles and San Francisco), a leading expert in the fields of stem cells and current director of the Bakar Aging Research Institute at UCSF. During my time working with Dr. Jones, I developed my own research interests focusing on how different aspects of metabolism impact the stem cell niche present in the Drosophila testis. Unexpectedly, I found that both stem cell populations present in the testis niche employ mechanisms to maintain proper lipid homeostasis in order to prevent stem cell loss. Disruptions in either mitochondrial fusion (in germline stem cells1) or autophagy (in cyst stem cells2) led to deficient lipid catabolism and ectopic accumulation of lipids in the stem cell niche, which promoted stem cell loss through differentiation. Hence, a model has emerged revealing a novel metabolic facet in the regulation of stem cell fate, which appears conserved across stem cell systems3. In my recently established laboratory, I am engaged in pursuing the mechanism(s) through which ectopic lipid accumulation can impact stem cell fate within the niche, which could shed light into the development of new strategies targeting stem cell-based regenerative therapies.

Abstract:

The capacity of stem cells to self-renew or differentiate has been attributed to distinct metabolic states. A genetic screen targeting regulators of mitochondrial dynamics revealed that mitochondrial fusion is required for male germline stem cell (GSC) maintenance in Drosophila melanogaster.  Depletion of Mitofusin (dMfn) or Optic atrophy 1 (Opa1) led to dysfunctional mitochondria, activation of Target of Rapamycin (TOR), and a dramatic accumulation of lipid droplets (LDs). Pharmacologic or genetic enhancement of lipid utilization by the mitochondria decreased LD accumulation, attenuated TOR activation and rescued GSC loss caused by inhibition of mitochondrial fusion. However, the mechanism(s) leading to GSC loss were unclear. TOR activation has been demonstrated to suppress JAK-STAT signaling by stabilizing the JAK-STAT inhibitor SOCS36E. As JAK-STAT signaling is critical for regulating stem cell self-renewal in the testis, we wanted to test the hypothesis that the increase in TOR activity in early germ cells would lead to SOCS36E stabilization, which in turn, could contribute to stem cell loss.  Indeed, we found that SOCS36E levels were higher in early germ cells upon depletion of dMfn or Opa1. Subsequently, we show that activation of the JAK-STAT pathway, but not BMP signaling, is sufficient to rescue loss of GSCs as a result of the block in mitochondrial fusion.  In addition, preliminary genetic and proximity-labeling data suggest that LD accumulation acts in parallel to TOR/SOCS36E to promote GSC loss. Our findings highlight a critical role for mitochondrial metabolism and lipid homeostasis in GSC maintenance, providing a framework for investigating the impact of metabolic diseases on stem cell function and tissue homeostasis.

Dr. Michael Long

Michael Long is the Thomas and Susanne Murphy Professor of Neuroscience at the NYU School of Medicine. He completed his graduate studies with Barry Connors at Brown University where he investigated the role of electrical synapses in the mammalian brain. During his postdoctoral work with Michale Fee at MIT, Long began to study the songbird model system to uncover the cellular and network properties that give rise to learned vocal sequences. Since beginning his laboratory in 2010, Long has focused his attention on the neural circuits underlying skilled movements, often in the service of vocal interactions. To accomplish this, the Long lab has taken a comparative approach, examining relevant mechanisms in the songbird, a newly characterized neotropical rodent, and humans. In addition to federal funding, the Long lab has also received support from NYSCF, the Rita Allen Foundation, the Klingenstein Foundation, and the Herschel-Weill Foundation.

Long Lab

Abstract:  Vocal communication is central to our everyday lives, facilitating social exchange. Despite significant recent discoveries, the neural mechanisms underlying coordinated vocal exchanges remain poorly understood. We examine the brain processes involved in interactive vocal behaviors, focusing on forebrain circuitry in the songbird and the rodent, and we relate these to emerging human studies that employ a range of methods to manipulate and monitor cortical areas relevant for speech.